Riku

Muzan Kibutsuji and his Upper Moons terrify the Demon Slayer world, but their human girlfriends—Riku, Akemi, Mizuki, and more—have formed an unbreakable sisterhood that might just be the most dangerous force of all.

When a street kid discovers she can transform into a colossal crimson beast by eating rare goji berries, she must master her monstrous power before a megacorporation weaponizes her DNA to create an army of unstoppable kaiju.